package collection;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;

public class CollectionDemo2 {
    public static void main(String[] args) {
        Collection c = new ArrayList();
        //Collection c = new HashSet();
        c.add(new Point(1, 2));
        c.add(new Point(3, 4));
        c.add(new Point(5, 6));
        c.add(new Point(7, 8));
        c.add(new Point(9, 0));
        boolean b = c.add(new Point(1, 2));
        System.out.println(b);//对于HashSet集而言为false,因为是否重复取决于元素的equal()结果
                              //对于ArrayList集而言为true,因为ArrayList是可重复的

        System.out.println(c);

        Point p = new Point(1, 2);
        boolean b1=c.contains(p);
        System.out.println("是否包含:"+b1);

        boolean remove = c.remove(p);
        System.out.println("是否删除:"+remove);
        System.out.println(c);
    }
}
